Add IsScalingDisabled and PP_PRINTOUTPUTFORMAT_EMF to pepper printing interface.

ppapi/cpp/dev/printing_dev.h

Index: ppapi/cpp/dev/printing_dev.h
diff --git a/ppapi/cpp/dev/printing_dev.h b/ppapi/cpp/dev/printing_dev.h
index 80d9fe483f98ff70bd7b02517997f4af727349b5..cf0a0aaa4a3c4b3b72bf560cebd16fdfee9bc4fa 100644
--- a/ppapi/cpp/dev/printing_dev.h
+++ b/ppapi/cpp/dev/printing_dev.h
@@ -23,6 +23,7 @@ class Printing_Dev {
   // PPP_Printing_Dev functions exposed as virtual functions for you to
   // override.
   virtual uint32_t QuerySupportedPrintOutputFormats() = 0;
+  virtual bool IsPrintScalingDisabled() = 0;
   virtual int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) = 0;
   virtual Resource PrintPages(const PP_PrintPageNumberRange_Dev* page_ranges,
                               uint32_t page_range_count) = 0;